Postretirement Benefit Plans - Amounts Recognized on the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	$ 85	$ 127
Accrued expenses and other liabilities	(22)	(15)
Underfunded retirement plans	(196)	(225)
Funded status (FVPA – BO) at end of year	(133)	(113)
U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	51	72
Accrued expenses and other liabilities	(16)	(9)
Underfunded retirement plans	(49)	(57)
Funded status (FVPA – BO) at end of year	(14)	6
U.S. retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	0	0
Accrued expenses and other liabilities	0	0
Underfunded retirement plans	(22)	(16)
Funded status (FVPA – BO) at end of year	(22)	(16)
Non-U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	34	55
Accrued expenses and other liabilities	(6)	(6)
Underfunded retirement plans	(125)	(152)
Funded status (FVPA – BO) at end of year	$ (97)	$ (103)